1 files changed, 13 insertions, 0 deletions
diff --git a/js/src/jit-test/tests/for-of/array-holes-4.js b/js/src/jit-test/tests/for-of/array-holes-4.js
new file mode 100644
index 0000000000..e4a8770260
--- /dev/null
+++ b/js/src/jit-test/tests/for-of/array-holes-4.js
@@ -0,0 +1,13 @@
+// for-of on an Array consults the prototype chain when it encounters a hole.
+
+load(libdir + "iteration.js");
+
+var m = {1: 'peek'};
+var a = [0, , 2, 3];
+a.__proto__ = m;
+var log = [];
+Object.prototype[Symbol.iterator] = Array.prototype[Symbol.iterator];
+for (var x of a)
+    log.push(x);
+assertEq(log[1], 'peek');
+assertEq(log.join(), "0,peek,2,3");